"There could be as many as three or four others (dead), and possibly up to 20 people that have been injured."

Authorities first heard reports of a man being shot while driving. Then, another report came in of a man being shot in the leg. After another shooting occurred in the Excel parking lot, the suspect was confirmed to have entered the building.

Walton added:

"This is just a horrible incident that's happened here… It's going to be a lot of sad people before this is all over."